Asked why Canada was getting a bivalent vaccine that targets the B.A.1 Omicron subvariant instead of what the U.S. is receiving, which targets B.A.4 or B.A.5, chief public health officer Dr. Theresa Tam said Thursday the dose being received provided an immune response that is “superior” against both the original strain and B.A.1, B.A. 4 and B.A.5.
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